Learn to Program with C_ Learn to Program using the Popular C Programming Language ( PDFDrive )

Chapter 5 ■ Programs with Repetition Logic
13 is entered and stored in num;
num is not 0 so we enter the while loop;
num (13) is added to sum (24), giving:
num 13 sum 37
55 is entered and stored in num;
num is not 0 so we enter the while loop;
num (55) is added to sum (37), giving:
num 55 sum 92
32 is entered and stored in num;
num is not 0 so we enter the while loop;
num (32) is added to sum (92), giving:
num 32 sum 124
19 is entered and stored in num;
num is not 0 so we enter the while loop;
num (19) is added to sum (124), giving:
num 19 sum 143
0 is entered and stored in num;
num is 0 so we exit the while loop and go to print sum with
num 0 sum 143
sum is now 143 so the algorithm prints 143.
When a while construct is being executed, we say the program is looping or the while loop is
being executed.
It remains to show how to express this algorithm in C. Program P5.1 shows how.
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